CN102930946A - Conduction cooling device for high-temperature superconducting magnet - Google Patents
Conduction cooling device for high-temperature superconducting magnet Download PDFInfo
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- CN102930946A CN102930946A CN2012103705062A CN201210370506A CN102930946A CN 102930946 A CN102930946 A CN 102930946A CN 2012103705062 A CN2012103705062 A CN 2012103705062A CN 201210370506 A CN201210370506 A CN 201210370506A CN 102930946 A CN102930946 A CN 102930946A
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- conduction cooling
- guide apparatus
- superconducting magnet
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- temperature superconducting
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Abstract
The invention discloses a conduction cooling device for a high-temperature superconducting magnet. The conduction cooling device is characterized by comprising a columnar conduction cooling plate (1) with a circular cross section, conduction cooling copper straps (2), a cold head connecting flange (4), an anti-radiation layer (5) and an annular bracket (6), wherein at least one conduction cooling copper strap (2) is fixed on each of the two axial ends and the middle part of the conduction cooling plate (1); the other end of each conduction cooling copper strap (2) is fixed on the cold head connecting flange (4); the anti-radiation layer (5) covers the outer surface of the conduction cooling plate (1); and the annular bracket (6) is fixed outside the conduction cooling plate, and is used for shaping the conduction cooling device and simultaneously strengthening the structural strength of the whole conduction cooling device. By the conduction cooling device, a temperature gradient in a conduction-cooled single-solenoid high-temperature superconducting magnet can be reduced, and the refrigeration speed of a conduction cooling structure also can be increased; and moreover, the structure of the conduction cooling plate has a large size high cooling capacity, so that the conduction cooling device also has a heat sink function.
Description
Technical field
The present invention relates to high-temperature superconducting magnet conduction Refrigeration Technique, is that a kind of high-temperature superconducting magnet conducts cooling cold guide apparatus structure specifically.
Background technology
Improve constantly and the significantly lifting of G-M refrigeration machine refrigeration power present 20 ~ 30K(kelvin degree along with the high temperature superconducting materia performance) become the most economic operation warm area of high-temperature superconductor high field magnet.The high-temperature superconducting magnet of hundreds of kilogram weights to be cooled to this warm area and mainly contain two class modes.Mode one is cryogenic gas convection current refrigeration, and for example cold helium freezes, and helium carries out exchange heat by G-M refrigeration machine refrigeration is rear by the high-temperature superconducting magnet surface.The advantage of convection current refrigeration is that refrigerating speed is fast, and the magnet temperature gradient is little; Shortcoming is that Dewar structure is complicated, and equipment cost is high.Another kind of mode is the conduction refrigeration, its basic principle is to utilize vacuum technique to eliminate heat convection between magnet and the external environment, utilize the heat radiation screening technology significantly to weaken extraneous thermal radiation, afterwards, by conduction structure the cold of G-M refrigeration machine is transmitted to the high-temperature superconducting magnet surface, realizes the cooling of magnet.The advantage of conduction refrigeration is that energy consumption is low, and equipment is simple, and compact conformation is convenient to safeguard, is applicable to power equipment.Major defect is that steady state temperature gradient is larger, and cooling rate is slower.
In order to reduce the temperature gradient of high-temperature superconducting magnet inside, improve the refrigerating speed of magnet, need to be optimized design to conduction structure.On the one hand, come conduction structure reasonable in design according to the profile of superconducting magnet, sufficient conduction cooling passage is set, on the other hand, select suitable material for conduction structure, formulate reliable processing technology.
Summary of the invention
Technical problem to be solved by this invention provides a kind of reduce the to conduct temperature gradient of refrigeration single solenoid high-temperature superconducting magnet inside, the high-temperature superconducting magnet cold guide apparatus of fast-refrigerating.
Described high-temperature superconducting magnet cold guide apparatus, it is characterized in that: comprise that conduction cooling copper strips, cold head adpting flange, radiation protective layer, ring support, cross section are the column conduction cooling plate of circular arc, each fixing at least one conduction cooling copper strips of the axial two ends of described conduction cooling plate and middle part, the other end of described conduction cooling copper strips is fixed in the cold head adpting flange, described conduction cooling plate outer surface covers radiation protective layer, described ring support is fixed in the outside of conduction cooling plate, be used to the cold guide apparatus setting, improve simultaneously the intensity of whole cold guide apparatus structure.
The hoop radian of described conduction cooling plate cross section is 270 ~ 330 °, and thickness is 5 ~ 15mm, and axial height is suitable with the height of the tubular high-temperature superconducting magnet of helical that cools off, and the inner surface of described conduction cooling plate and the outer surface of superconducting magnet keep the spacing of 30 ~ 50mm.
Described conduction cooling copper strips forms the multi-disc Copper Foil by the high purity copper establishment band through the insulation impregnation process and is formed by stacking, and consists of syndeton with welding, riveted joint or bolt connecting mode and other parts.
Described conduction cooling copper strips needs clamping indium sheet with in riveted joint or the bolted structure at the joint face place, to reduce contact heat resistance.
Described conduction cooling copper strips is fixedly welded on the axial middle part in the cold guide apparatus outside, is used for connecting cold guide apparatus and cold head adpting flange.
Described conduction cooling copper strips is fixedly welded on the axial end portion of cold guide apparatus, is used for connecting the cool guiding rod of cold guide apparatus and magnet.
By the cold head adpting flange that fine copper is made, bolt is connected in G-M refrigeration machine cold head, is used for the cold guiding cold guide apparatus with cold head, at joint face place clamping indium sheet, to reduce contact heat resistance.
The radiation protective layer made from aluminium foil is with plated film or the bonding surface that is covered in circular arc conduction cooling plate.
The ring support made from the insulating material of high mechanical properties under the low temperature is comprised of at least one annular configuration, is fixed in the outside of circular arc conduction cooling plate.
The described ring support that epoxy glass fiber material or polytetrafluoroethylmaterial material are made has two loop configuration to be fixed in the outside of conduction cooling plate.
The present invention can reduce to conduct the temperature gradient of refrigeration single solenoid high-temperature superconducting magnet inside, can also improve the refrigerating speed of conduction refrigeration structure simultaneously.Braiding structure and the insulation impregnating of the circular arc structure of conduction cooling plate, the selection of dimension of cold guide apparatus, conduction cooling copper strips are processed the eddy current loss that all is conducive to reduce in the magnet course of work.The connected mode of the connected mode of copper strips and miscellaneous part and cold head adpting flange and cold head helps to reduce contact heat resistance, improves the conduction cooling efficient of whole conduction cooling plate structure.The introducing of radiation protective layer helps to reduce the photothermal intrusion of magnet.The introducing of supporting structure has then improved the bulk strength of cold guide apparatus structure, has widened its range of application.In addition, this cold guide apparatus structure not only has function, the protective shield of radiation function of conduction cooling passage, and because the conduction cooling plate structure has larger quality, can store more cold, so it also has heat sink function.
Description of drawings
Fig. 1 is structural representation of the present invention,
Fig. 2 is the superconducting magnet structure schematic diagram,
Fig. 3 is G-M refrigeration machine cold head structural representation,
Fig. 4 is the installation diagram of cold guide apparatus and superconducting magnet, current feed and refrigeration machine cold head.
Wherein: label 1-conduction cooling plate, 2-conduction cooling copper strips, 3-tie point, 4-adpting flange, 5-radiation protective layer, 6-ring support, the two cakes of 7-superconduction, 8-cool guiding rod, 9-upper stainless steel adpting flange, 10-lower stainless steel adpting flange, 11-cool guide sheet, 12-current lead of superconducting magnets, 13-G-M refrigeration machine cold head.
Embodiment
The present invention is further described below in conjunction with accompanying drawing: high-temperature superconducting magnet cold guide apparatus as shown in fig. 1, it comprises: cross section is the column conduction cooling plate 1 of circular arc, conduction cooling copper strips 2, cold head adpting flange 4, radiation protective layer 5, ring support 6, each fixing at least one conduction cooling copper strips 2 of the axial two ends of described conduction cooling plate 1 and middle part, the other end of described conduction cooling copper strips 2 is fixed in cold head adpting flange 4, described conduction cooling plate 1 outer surface covers radiation protective layer 5, described ring support 6 is fixed in the outside of conduction cooling plate, be used to the cold guide apparatus setting, improve simultaneously the intensity of whole cold guide apparatus structure.
Circular arc conduction cooling plate adopts highly heat-conductive material, for example metal material or thermal conductive ceramic material (such as AlN pottery), can form by casting or by the sheet material stample fiber, the both sides of conduction cooling coiled sheet Qu Xiangxiang need keep enough spacings of placing high-temperature superconducting magnet current feed 12.
The hoop radian of described conduction cooling plate 1 cross section is 270 ~ 330 °, thickness is 5 ~ 15mm, axial height is suitable with the height of the tubular high-temperature superconducting magnet 14 of the helical that cools off, and the outer surface of the inner surface of described conduction cooling plate 1 and superconducting magnet 14 keeps the spacing of 30 ~ 50mm.
Described conduction cooling copper strips 2 forms the multi-disc Copper Foil by the high purity copper establishment band through the insulation impregnation process and is formed by stacking, and consists of syndeton with welding, riveted joint or bolt connecting mode and other parts.
Described conduction cooling copper strips 2 needs clamping indium sheet with in riveted joint or the bolted structure at the joint face place, to reduce contact heat resistance.
Described conduction cooling copper strips is divided into two classes, and a class is welded in the axial middle part in the conduction cooling plate outside, is used for connecting cold guide apparatus and cold head adpting flange 4, and the another kind of axial end portion that is welded in cold guide apparatus is for the cool guiding rod that connects cold guide apparatus and magnet.
By the cold head adpting flange 4 that fine copper is made, bolt is connected in G-M refrigeration machine cold head 13, and cold head is used for the cold guiding cold guide apparatus with cold head, as shown in Figure 3 at joint face place clamping indium sheet, to reduce contact heat resistance.
Radiation protective layer is made by radiation proof material, such as aluminium foil, alumetize polyester fibre film, aluminium-foil paper etc.The radiation protective layer 5 made from aluminium foil is with plated film or the bonding surface that is covered in circular arc conduction cooling plate 1.Can adopt plated film or the mode such as bonding to add, the radiant heat that brings to cold guide apparatus for reducing extraneous radiation.
The ring support 6 made from the insulating material of high mechanical properties under the low temperature is comprised of at least one annular configuration, is fixed in the outside of circular arc conduction cooling plate 1.
For example the described ring support 6 made of epoxy glass fiber material or polytetrafluoroethylmaterial material has two loop configuration to be fixed in the outside of conduction cooling plate 1.
Among the present invention, the selection of dimension of the circular arc of conduction cooling plate structure, cold guide apparatus, the braiding structure of conduction cooling copper strips and insulation impregnating are processed the eddy current loss that all is conducive to reduce in the magnet course of work.The connected mode of the connected mode of copper strips and miscellaneous part and cold head adpting flange and cold head helps to reduce contact heat resistance, improves the conduction cooling efficient of whole conduction cooling plate structure.Radiation protective layer must be introduced and help to reduce the photothermal intrusion of magnet.The introducing of supporting structure has then improved the bulk strength of conduction cooling plate structure, has widened its range of application.In addition, this cold guide apparatus structure not only has function, the protective shield of radiation function of conduction cooling passage, and because the cold guide apparatus structure has larger quality, can store more cold, so it also has heat sink function.
Take 100kJ/50kW conduction cooling SMES(super conductive magnetic storage energy) magnet introduced the present invention as embodiment, and superconducting magnet and the conduction cooling of self structure are as shown in Figure 2.The basic structure of conduction cooling magnet comprises: the two cakes 7 of superconduction, high purity copper cool guiding rod 8, upper stainless steel adpting flange 9, lower stainless steel adpting flange 10, high purity copper cool guide sheet 11.The basic parameter of each structure is as shown in table 1.
Table 1100kJ/50kW SMES magnet major parameter
Figure 3 shows that G-M refrigeration machine cold head structure chart, cold head is cylindrical, and the refrigerating section diameter is 100mm, highly is 80mm.
According to the design feature of conduction cooling magnet and G-M refrigeration machine cold head, the basic parameter of circular arc conduction cooling plate structure is as shown in table 2
The basic parameter of table 2 circular arc conduction cooling plate structure
Figure 4 shows that the installation diagram of conduction cooling plate and superconducting magnet, current feed and refrigeration machine cold head.Wherein adopt between conduction cooling copper strips 2 and the conduction cooling plate main body 1 to be welded to connect, middle part copper strips 2 also adopts with cold head adpting flange 4 and is welded to connect, and end copper strips 2 is with bolts with magnet cool guiding rod 8, and the joint face place is lined with 0.1mm indium sheet.Space between the conduction cooling plate main body 1 curling both sides in opposite directions is used for laying superconductive current lead 12.Cold head adpting flange 4 is lined with the thick indium sheet of 0.1mm equally with the contact-making surface of G-M refrigeration machine cold head 13.
Claims (10)
1. high-temperature superconducting magnet cold guide apparatus, it is characterized in that: comprise conduction cooling copper strips (2), cold head adpting flange (4), radiation protective layer (5), ring support (6), cross section is the column conduction cooling plate (1) of circular arc, each fixing at least one conduction cooling copper strips (2) of the axial two ends of described conduction cooling plate (1) and middle part, the other end of described conduction cooling copper strips (2) is fixed in cold head adpting flange (4), described conduction cooling plate (1) outer surface covers radiation protective layer (5), described ring support (6) is fixed in the outside of conduction cooling plate, be used to the cold guide apparatus setting, improve simultaneously the intensity of whole cold guide apparatus structure.
2. high-temperature superconducting magnet cold guide apparatus according to claim 1, it is characterized in that: the hoop radian of described conduction cooling plate (1) cross section is 270 ~ 330 °, thickness is 5 ~ 15mm, axial height is suitable with the height of the tubular high-temperature superconducting magnet of the helical that cools off (14), and the outer surface of the inner surface of described conduction cooling plate (1) and superconducting magnet (14) keeps the spacing of 30 ~ 50mm.
3. high-temperature superconducting magnet cold guide apparatus according to claim 1, it is characterized in that: described conduction cooling copper strips (2) forms the multi-disc Copper Foil by the high purity copper establishment band through the insulation impregnation process and is formed by stacking, and consists of syndeton with welding, riveted joint or bolt connecting mode and other parts.
4. high-temperature superconducting magnet cold guide apparatus according to claim 3 is characterized in that: described conduction cooling copper strips (2) needs clamping indium sheet with in riveted joint or the bolted structure at the joint face place, to reduce contact heat resistance.
5. according to claim 1, one of 3 or 4 described high-temperature superconducting magnet cold guide apparatus, it is characterized in that: described conduction cooling copper strips (2) is fixedly welded on the axial middle part in the cold guide apparatus outside, is used for connecting cold guide apparatus and cold head adpting flange (4).
6. according to claim 1, one of 3 or 4 described high-temperature superconducting magnet cold guide apparatus, it is characterized in that: described conduction cooling copper strips (2) is fixedly welded on the axial end portion of cold guide apparatus, is used for connecting the cool guiding rod of cold guide apparatus and magnet.
7. high-temperature superconducting magnet cold guide apparatus according to claim 1, it is characterized in that: by the cold head adpting flange (4) that fine copper is made, bolt is connected in G-M refrigeration machine cold head (13), is used for the cold guiding cold guide apparatus with cold head, at joint face place clamping indium sheet, to reduce contact heat resistance.
8. high-temperature superconducting magnet cold guide apparatus according to claim 1 is characterized in that: the radiation protective layer (5) made from aluminium foil is with plated film or the bonding surface that is covered in circular arc conduction cooling plate (1).
9. high-temperature superconducting magnet cold guide apparatus according to claim 1, it is characterized in that: the ring support (6) made from the insulating material of high mechanical properties under the low temperature is comprised of at least one annular configuration, is fixed in the outside of circular arc conduction cooling plate (1).
10. high-temperature superconducting magnet cold guide apparatus according to claim 9, it is characterized in that: the described ring support (6) that epoxy glass fiber material or polytetrafluoroethylmaterial material are made has two loop configuration to be fixed in the outside of conduction cooling plate (1).
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103779033A (en) * | 2014-02-09 | 2014-05-07 | 奥泰医疗系统有限责任公司 | Low-temperature cooling system |
| CN109036758A (en) * | 2018-07-16 | 2018-12-18 | 中国科学院合肥物质科学研究院 | A kind of horizontal positioned high-temperature superconducting magnet cooling capacity transferring structure |
| CN109148679A (en) * | 2018-08-23 | 2019-01-04 | 北京无线电计量测试研究所 | A kind of quantum superconduction chip is thermally connected part and production method |
| CN114823039A (en) * | 2022-04-15 | 2022-07-29 | 华北电力大学 | Efficient and flexible superconducting magnet cold conduction method |
| CN115291148A (en) * | 2022-09-29 | 2022-11-04 | 中国科学院合肥物质科学研究院 | Large superconducting magnet low-temperature test supporting device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103779033A (en) * | 2014-02-09 | 2014-05-07 | 奥泰医疗系统有限责任公司 | Low-temperature cooling system |
| CN109036758A (en) * | 2018-07-16 | 2018-12-18 | 中国科学院合肥物质科学研究院 | A kind of horizontal positioned high-temperature superconducting magnet cooling capacity transferring structure |
| CN109036758B (en) * | 2018-07-16 | 2020-06-23 | 中国科学院合肥物质科学研究院 | Cold volume transmission structure of high temperature superconducting magnet is placed to level |
| CN109148679A (en) * | 2018-08-23 | 2019-01-04 | 北京无线电计量测试研究所 | A kind of quantum superconduction chip is thermally connected part and production method |
| CN114823039A (en) * | 2022-04-15 | 2022-07-29 | 华北电力大学 | Efficient and flexible superconducting magnet cold conduction method |
| CN115291148A (en) * | 2022-09-29 | 2022-11-04 | 中国科学院合肥物质科学研究院 | Large superconducting magnet low-temperature test supporting device |
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